Long-duration Contracts - Schedule of Net Liability Position of Market Risk Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Market Risk Benefit [Roll Forward]
Ending balance	$ 3,340	$ 2,763
Less: Reinsurance recoverable	(10)
Balance, at March 31, 2023, net of reinsurance	3,330
Traditional Deferred Annuities and Indexed Annuities
Market Risk Benefit [Roll Forward]
Beginning balance	3,373	2,489
Effect of changes in instrument-specific credit risk, beginning balance	(8)	366
Balance, beginning of period, before changes in instrument-specific credit risk	3,304	3,218	$ 3,365	$ 2,855
Issuances	93	17
Interest accrual	50	34
Attributed fees collected	87	85
Benefit payments	(17)	(6)
Effect of changes in interest rates	(228)	226
Effect of changes in equity	(73)	(18)
Effect of actual policyholder behavior compared to expected behavior	27	25
Balance, end of period, before changes in instrument-specific credit risk	3,304	3,218
Effect of changes in instrument-specific credit risk, ending balance	(36)	455
Ending balance	3,340	2,763
Traditional Deferred Annuities
Market Risk Benefit [Roll Forward]
Beginning balance	192	170
Effect of changes in instrument-specific credit risk, beginning balance	2	13
Balance, beginning of period, before changes in instrument-specific credit risk	190	196	194	183
Issuances	0	0
Interest accrual	3	2
Attributed fees collected	1	1
Benefit payments	(2)	0
Effect of changes in interest rates	(8)	8
Effect of changes in equity	0	0
Effect of actual policyholder behavior compared to expected behavior	2	2
Balance, end of period, before changes in instrument-specific credit risk	190	196
Effect of changes in instrument-specific credit risk, ending balance	1	16
Ending balance	189	180
Less: Reinsurance recoverable	0
Balance, at March 31, 2023, net of reinsurance	189
Reconciliation of the gross balances in an asset or liability position:
Net amount at risk	$ 425	$ 423
Weighted-average attained age of contract holders (in years)	76 years	75 years
Indexed Annuities
Market Risk Benefit [Roll Forward]
Beginning balance	$ 3,181	$ 2,319
Effect of changes in instrument-specific credit risk, beginning balance	(10)	353
Balance, beginning of period, before changes in instrument-specific credit risk	3,114	3,022	$ 3,171	$ 2,672
Issuances	93	17
Interest accrual	47	32
Attributed fees collected	86	84
Benefit payments	(15)	(6)
Effect of changes in interest rates	(220)	218
Effect of changes in equity	(73)	(18)
Effect of actual policyholder behavior compared to expected behavior	25	23
Balance, end of period, before changes in instrument-specific credit risk	3,114	3,022
Effect of changes in instrument-specific credit risk, ending balance	(37)	439
Ending balance	3,151	2,583
Less: Reinsurance recoverable	(10)
Balance, at March 31, 2023, net of reinsurance	3,141
Reconciliation of the gross balances in an asset or liability position:
Net amount at risk	$ 14,995	$ 13,903
Weighted-average attained age of contract holders (in years)	69 years	69 years